Sore throat with yellow puss bags on throat wall so hard to swallow. Been 5 days, no fever, no runny nose or cough, and no improvement on penicillin?

Go back to doctor. This may be viral, or possibly a rare bacterial cause of pharyngitis other than group a strep. You may need a throat culture, or perhaps just some reassurance but you should certainly have this re-examined. Hope you are better soon.